INCONEL alloy 690 is a high-chromium nickel alloy having excellent resistance to many corrosive aqueous media and high-temperature atmospheres&period; The alloy's high chromium content gives it excellent resistance to aqueous corrosion by oxidizing acids &lpar;especially nitric acid&rpar; and salts&comma; and to sulfidation at high-temperatures&period; In addition to its corrosion resistance&comma; alloy 690 has high strength&comma; good metallurgical stability&comma; and favorable fabrication characteristics&period;